Condensed Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS (USED IN) OPERATING ACTIVITIES
Net loss	$ (2,290,649)	$ (10,264,477)
Adjustments to reconcile net loss to net cash (used in) operating activities
Depreciation and amortization	166,386	30,866
Loss on disposal of fixed assets		432
Gain on sale of intellectual property	(1,000,000)
Employee and director stock-based compensation	145,794	313,027
Convertible note fair value adjustment	285,329	3,210,338
Changes in other assets and liabilities affecting cash flows from operations
Prepaid expenses and other assets	100,928	84,227
Accounts payable and accrued liabilities	(1,553,257)	(1,063,726)
Net cash (used in) operating activities	(4,145,469)	(7,689,313)
CASH FLOWS (USED IN) INVESTING ACTIVITIES
Funding of restricted cash	(2,260,100)
Proceeds from sale of intellectual property	1,000,000
Purchase of fixed assets		(54,234)
Purchase of investment		(7,955)
Net cash (used in) investing activities	(1,260,100)	(62,189)
NET (DECREASE) IN CASH AND CASH EQUIVALENTS	(5,405,569)	(7,751,502)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	34,794,341	57,225,234
CASH AND CASH EQUIVALENTS AT END OF PERIOD	29,388,772	49,473,732
Noncash financing activities
Shares issued for convertible senior notes and accrued interest		$ 10,132,534